Leaf-miner: The gallery is long and broad, frass dispersed in later part
of mine (British
leafminers).

Oviposition
on the leaf underside, almost always close to a thick vein. Mine
a fairly long, rather slender corridor. Frass in a broad, often
interrupted central band; locally it may be in coiled (Bladmineerders van Europa).

It is recommended that you try to rear out the adults to be certain of their identity.

Larva: The larvae of moths have a head capsule and chewing mouthparts with opposable mandibles (see video of a gracillarid larva feeding), six thoracic legs and abdominal legs (see examples).

Distribution
in Great Britain and Ireland: Widespread in England including
Bedfordshire, Buckinghamshire, Cambridgeshire. Denbighshire, Dorset, East Kent, East Norfolk, East Suffolk, Hertforsdhire, Huntingdonshire, Isle of Wight, Leicestershire, Middlesex,
North Essex, North Hampshire, North Somerset, Radnorshire, Shropshire, South Essex, South Hampshire, South Somerset, Stafford, West Kent, West Norfolk, West Suffolk and Worcestershire (NBN
Atlas).